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Magnetic field effects

Khalil Ur Rehman, Noor Ul Saba, M Y Malik, Iffat Zehra
The current paper contains the simultaneous analysis of both Newtonian and non-Newtonian nanofluid models. The fluid flow is achieved by considering the no-slip condition subject to a stretched cylindrical surface. The flow regime manifests with pertinent physical effects, namely temperature stratification, concentration stratification, thermal radiation, heat generation, magnetic field, dual convection and chemical reaction. The strength of fluid temperature and nanoparticles concentration adjacent to an inclined cylindrical surface is assumed to be higher than the ambient flow field...
March 22, 2018: European Physical Journal. E, Soft Matter
Sandeep K Gupta, Ramaswamy Murugavel
Rapidly growing modern information technology demands energy and cost efficient tools that can efficiently store and process a large amount of data. However, the miniaturization technology that was being used to boost the performance of the electronic devices, keeping up with the pace as estimated by Moore's law, is reaching its limit. To overcome these challenges, several alternative routes that can eventually mimic the modern electronics fabrication using silicon have been proposed. Single molecule magnets (SMMs), being considered as one of the potential alternatives, have gone through significant progress and the focus has shifted from the use of polynuclear clusters to mononuclear complexes in the last few years...
March 22, 2018: Chemical Communications: Chem Comm
Zahra Rostami, Sajad Jafari
Complex anatomical and physiological structure of an excitable tissue (e.g., cardiac tissue) in the body can represent different electrical activities through normal or abnormal behavior. Abnormalities of the excitable tissue coming from different biological reasons can lead to formation of some defects. Such defects can cause some successive waves that may end up to some additional reorganizing beating behaviors like spiral waves or target waves. In this study, formation of defects and the resulting emitted waves in an excitable tissue are investigated...
April 2018: Cognitive Neurodynamics
Waheed Khan, Qun Wang, Xin Jin
We report the first results of functional properties of nitrogenized silver-permalloy thin films deposited on polyethylene terephthalic ester {PETE (C10 H₈O₄)n } flexible substrates by magnetron sputtering. These new soft magnetic thin films have magnetization that is comparable to pure Ni81 Fe19 permalloy films. Two target compositions (Ni76 Fe19 Ag₅ and Ni72 Fe18 Ag10 ) were used to study the effect of compositional variation and sputtering parameters, including nitrogen flow rate on the phase evolution and surface properties...
March 17, 2018: Materials
Robert Gibbs, Gregory Moreton, Turgut Meydan, Paul Williams
The investigation of planar coils of differing topologies, when combined with a magnetostrictive amorphous ribbon to form a stress-sensitive self-inductor, is an active research area for applications as stress or pressure sensors. Four topologies of planar coil (Circular, Mesh, Meander, and Square) have been constructed using copper track on 30 mm wide PCB substrate. The coils are energized to draw 0.4 A and the resulting magnetic field distribution is observed with a newly developed three-dimensional magnetic field scanner...
March 21, 2018: Sensors
Aaron B Christian, Aaron T Schye, Kelvin O White, John Neumeier
The magnetic, thermal, and optical properties of single-crystalline CoTa$_2$O$_6$ and FeTa$_2$O$_6$ are reported. Optical dichroism was observed in CoTa$_2$O$_6$. Magnetic susceptibility $\chi$($T$) measurements reveal long-range antiferromagnetic order with N\'eel temperatures $T_N$ = 6.12(5)~K and 8.11(5)~K, respectively, and anisotropy in $\chi$. The thermal expansion coefficients exhibit significant anisotropy and the influence of the magnetic ions and long-range order. A structural phase transition to orthorhombic occurs below $T_N$ for FeTa$_2$O$_6$...
March 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Eduardo Guisasola, Laura Asín, Lillianne Beola, Jesús M De La Fuente, Alejandro Baeza, María Vallet Regí
This work presents an innovation in the tumor treatment in vivo mediated by magnetic mesoporous silica nanoparticles (MMSNs). This device was built with iron oxide magnetic nanoparticles embedded in a mesoporous silica matrix and coated with an engineered thermoresponsive polymer. The magnetic nanoparticles act as internal heating sources under an alternating magnetic field (AMF) that increase the temperature of the surroundings, provoking the polymer transition and consequently the release of a drug trapped inside the silica pores...
March 21, 2018: ACS Applied Materials & Interfaces
Ap Kuiroukidis, G N Throumoulopoulos
We consider a generalized Grad-Shafranov equation (GGSE) in a triangularity-deformed axisymmetric toroidal coordinate system and solve it numerically for the generic case of ITER-like and JET-like equilibria with non-parallel flow. It turns out that increase of the triangularity improves confinement by leading to larger values of the toroidal beta and the safety factor. This result is supported by the application of a criterion for linear stability valid for equilibria with flow parallel to the magnetic field...
January 2018: Heliyon
Mohammad Javad Tahmasebi Birgani, Nahid Chegeni, Mansour Zabihzadeh, Marziyeh Tahmasbi
Background: Integrated proton therapy - MRI systems are capable of delivering high doses to the target tissues near sensitive organs and achieve better therapeutic results; however, the applied magnetic field for imaging, influences the protons path, changes the penetration depth and deflects the particles, laterally, leading to dose distribution variations. Objective: To determine the effects of a magnetic field on the range and the lateral deflection of protons, analytically...
December 2017: Electronic Physician
Massimiliano Polastri, Vittoria Comellini, Angela Maria Grazia Pacilli, Stefano Nava
Magnetotherapy (MT) is a therapeutic treatment based on the use of magnetic fields (MF) that can have an anti-inflammatory and analgesic effect. MT represents a possible treatment or an ancillary therapeutic intervention for a wide range of diseases and it is often used in the field of physiotherapeutic practices. A crucial point in the treatment of chronic obstructive pulmonary disease (COPD) patients, to counteract muscular depletion and respiratory symptoms, is represented by physiotherapy. Nevertheless, the knowledge about the application of MF as a therapeutic option in COPD patients is very limited...
March 20, 2018: COPD
Patryk Zradziński
PURPOSE: In this work, the inter-person variability of hazards caused by a low frequency magnetic field exposure (of various polarisation and homogeneity near to the magneto therapy applicator) to users of BAHA hearing implants were investigated with respect to various head structures. MATERIAL AND METHODS: The effects of exposure were evaluated by numerical simulations of the electric field (Ein ) induced in head phantoms (regular or with implant model). Phantoms mimic head dimensions and thicknesses of layers of skin, fat, skull bones and brain...
March 20, 2018: International Journal of Radiation Biology
Jérôme Long, Dimitry M Lyubov, Tatyana V Mahrova, Anton V Cherkasov, Georgy K Fukin, Yannick Guari, Joulia Larionova, Alexander A Trifonov
We report on the synthesis, structure and investigation of magnetic properties of a series of six heteroleptic complexes of the general formula [Ln(Tpm)X3]·yMeCN (Tpm = tris(3,5-dimethylpyrazolyl)methane; Ln = Tb, Dy, Er; X- = NO3-, Cl- and y = 1 or 2). We demonstrate that the observation of a field-induced slow relaxation of magnetization is highly dependent on the anion's nature. While nitrate moieties appear to be suitable to stabilize the oblate electronic density of Dy3+, chloride ions generate an equatorial crystal-field allowing the slow relaxation of the prolate Er3+ ions...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jianming Lu, Oleksandr Zheliuk, Qihong Chen, Inge Leermakers, Nigel E Hussey, Uli Zeitler, Jianting Ye
Many recent studies show that superconductivity not only exists in atomically thin monolayers but can exhibit enhanced properties such as a higher transition temperature and a stronger critical field. Nevertheless, besides being unstable in air, the weak tunability in these intrinsically metallic monolayers has limited the exploration of monolayer superconductivity, hindering their potential in electronic applications (e.g., superconductor-semiconductor hybrid devices). Here we show that using field effect gating, we can induce superconductivity in monolayer WS2 grown by chemical vapor deposition, a typical ambient-stable semiconducting transition metal dichalcogenide (TMD), and we are able to access a complete set of competing electronic phases over an unprecedented doping range from band insulator, superconductor, to a reentrant insulator at high doping...
March 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
Reza Abazari, Ali Reza Mahjoub, Soheila Molaie, Fatemeh Ghaffarifar, Ezatollah Ghasemi, Alexandra M Z Slawin, Cameron L Carpenter-Warren
In this work, a magnetic bio-metal-organic framework (MBMOF) nanocomposite with porous-layer open morphology is synthesized through a simple sonochemical approach and its effects on Leishmania major (MRHO/IR/75/ER) under both in vitro and in vivo conditions are investigated. The effects of sonication time, initial concentration of reagents and sonication power on size and morphology of MBMOF nanocomposites have been investigated and optimized. A comparison was then made between the structural information of the nanostructures and that of the bio-metal-organic framework crystals...
May 2018: Ultrasonics Sonochemistry
L Bua, E Tibaldi, L Falcioni, M Lauriola, L De Angelis, F Gnudi, M Manservigi, F Manservisi, I Manzoli, I Menghetti, R Montella, S Panzacchi, D Sgargi, V Strollo, A Vornoli, D Mandrioli, F Belpoggi
BACKGROUND: Up to now, experimental studies on rodents have failed to provide definitive confirmation of the carcinogenicity of extremely low frequency electromagnetic fields (ELFEMF). Two recent studies performed in our laboratory on Sprague-Dawley rats reported a statistically significant increase in malignant tumors of different sites (mammary gland, C-cells carcinoma, hemolymphoreticular neoplasia, and malignant heart Schwannoma) when ELFEMF exposure was associated with exposure to formaldehyde (50 mg/l) or acute low dose of γ-radiation (0...
March 14, 2018: Environmental Research
George J Lu, Arash Farhadi, Arnab Mukherjee, Mikhail G Shapiro
A long-standing goal of molecular imaging is to visualize cellular function within the context of living animals, necessitating the development of reporter genes compatible with deeply penetrant imaging modalities such as ultrasound and magnetic resonance imaging (MRI). Until recently, no reporter genes for ultrasound were available, and most genetically encoded reporters for MRI were limited by metal availability or relatively low sensitivity. Here we review how these limitations are being addressed by recently introduced reporter genes based on air-filled and water-transporting biomolecules...
March 14, 2018: Current Opinion in Chemical Biology
Nicola Pinto, S Javad Rezvani, Andrea Perali, Luca Flammia, Milorad V Milošević, Matteo Fretto, Cristina Cassiago, Natascia De Leo
Superconducting and normal state properties of Niobium nanofilms have been systematically investigated as a function of film thickness, on different substrates. The width of the superconducting-to-normal transition for all films is remarkably narrow, confirming their high quality. The superconducting critical current density exhibits a pronounced maximum for thickness around 25 nm, marking the 3D-to-2D crossover. The magnetic penetration depth shows a sizeable enhancement for the thinnest films. Additional amplification effects of the superconducting properties have been obtained with sapphire substrates or squeezing the lateral size of the nanofilms...
March 16, 2018: Scientific Reports
Sebastian Huhn, Frauke Beyer, Rui Zhang, Leonie Lampe, Jana Grothe, Jürgen Kratzsch, Anja Willenberg, Jana Breitfeld, Peter Kovacs, Michael Stumvoll, Robert Trampel, Pierre-Louis Bazin, Arno Villringer, A Veronica Witte
INTRODUCTION: The polyphenol resveratrol has been suggested to exert beneficial effects on memory and the aging hippocampus due to calorie-restriction mimicking effects. However, the evidence based on human interventional studies is scarce. We therefore aimed to determine the effects of resveratrol on memory performance, and to identify potential underlying mechanisms using a broad array of blood-based biomarkers as well as hippocampus connectivity and microstructure assessed with ultra-high field magnetic resonance imaging (UHF-MRI)...
March 13, 2018: NeuroImage
Song Cheng, Libo Zhang, Aiyuan Ma, Hongying Xia, Jinhui Peng, Chunyang Li, Jianhua Shu
The methylene blue (MB) removal abilities of raw activated carbon and iron/cerium modified raw activated carbon (Fe-Ce-AC) by adsorption were researched and compared. The characteristics of Fe-Ce-AC were examined by N2 adsorption, zeta potential measurement, FTIR, Raman, XRD, XPS, SEM and EDS. After modification, the following phenomena occurred: The BET surface area, average pore diameter and total pore volume decreased; the degree of graphitization also decreased. Moreover, the presence of Fe3 O4 led to Fe-Ce-AC having magnetic properties, which makes it easy to separate from dye wastewater in an external magnetic field and subsequently recycle...
March 2018: Journal of Environmental Sciences (China)
J Hernández-Rojas, F Calvo
Magnetic colloidal clusters can form chain, ring, and more compact structures depending on their size. In the present investigation we examine the combined effects of temperature and external magnetic field on these configurations by means of extensive Monte Carlo simulations and a dedicated analysis based on inherent structures. Various thermodynamical, geometric, and magnetic properties are calculated and altogether provide evidence for possibly multiple structural transitions at low external magnetic field...
February 2018: Physical Review. E
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